--- old/src/share/vm/gc_implementation/g1/concurrentZFThread.hpp	2010-10-28 13:54:28.000000000 +0200
+++ new/src/share/vm/gc_implementation/g1/concurrentZFThread.hpp	2010-10-28 13:54:28.000000000 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2009, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -22,6 +22,11 @@
  *
  */
 
+#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTZFTHREAD_HPP
+#define SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTZFTHREAD_HPP
+
+#include "gc_implementation/shared/concurrentGCThread.hpp"
+
 // The Concurrent ZF Thread.  Performs concurrent zero-filling.
 
 class ConcurrentZFThread: public ConcurrentGCThread {
@@ -82,3 +87,5 @@
 
   static void print_summary_info();
 };
+
+#endif // SHARE_VM_GC_IMPLEMENTATION_G1_CONCURRENTZFTHREAD_HPP